Created
December 6, 2018 01:29
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1msのtimerで実質2ms待ちになる調査
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-module(timer_test). | |
-export([test/2]). | |
test(Wait, Count) -> | |
Begin = erlang:timestamp(), | |
wait_repeat(Wait, Count), | |
End = erlang:timestamp(), | |
DiffUsec = timer:now_diff(End, Begin), | |
DiffSec = DiffUsec / 1000 / 1000, | |
io:format("~p counts in ~p sec, ~p count/sec~n", [Count, DiffSec, Count/DiffSec]). | |
wait_repeat(_Wait, 0) -> | |
ok; | |
wait_repeat(Wait, N) -> | |
timer:sleep(Wait), | |
wait_repeat(Wait, N-1). |
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See Measure Elapsed Time at http://erlang.org/doc/apps/erts/time_correction.html#how-to-work-with-the-new-api